United States Nuclear Regulatory Commission - Protecting People and the Environment

General Information or Other Event Number: 38104
REP ORG: GE NUCLEAR ENERGY NOTIFICATION DATE: 06/29/2001
LICENSEE: GE NUCLEAR ENERGY NOTIFICATION TIME: 13:31[EDT]
CITY: SAN JOSE REGION: 4 EVENT DATE: 06/29/2001
COUNTY: STATE: CA EVENT TIME: [PDT]
LICENSE#: AGREEMENT: Y LAST UPDATE DATE: 06/29/2001
DOCKET: PERSON ORGANIZATION
GREG PICK R4
RICHARD BARKLEY R1
THOMAS DECKER R2
NRC NOTIFIED BY: JASON POST GEOFFREY WRIGHT R3
HQ OPS OFFICER: FANGIE JONES VERN HODGE (FAX) NRR
EMERGENCY CLASS: NON EMERGENCY
10 CFR SECTION:
CCCC 21.21 UNSPECIFIED PARAGRAPH

EVENT TEXT

10 CFR 21 REPORT: STABILITY RELOAD LICENSING CALCULATIONS MAY BE NON-CONSERVATIVE

"This letter provides information concerning the potential for non-conservative reload licensing calculations for plants which have implemented stability detect and suppress trip systems. The non-conservatism could result in (1) Option Ill stability trip system setpoints which do not provide Minimum Critical Power Ration (MCPR) Safety Limit protection, and (2) inadequate MCPR safety limit protection from the flow-biased Average Power Range Monitor (APRM) flux trip for plants which have implemented Option I-D or Option 11. This notification is provided under 10 CFR Part 21(d) as a reportable condition for Hatch Units 1 and 2, and as an interim report per �21.21(a)(2) for the other plants listed in Attachment 1: the full impact of this deviation cannot be completed within 60 days from the date of discovery. Therefore, this notification describes the deviation that is being evaluated by GE Nuclear Energy (GE-NE) for associated safety related reload licensing calculations supplied to licensees by GE-NE and states when the evaluation will be completed.

"In addition, GE-NE does not have the capability to perform the evaluation to determine if a defect exists for plants at which GE-NE is not responsible for stability reload licensing calculations. GE-NE has transferred information pursuant to �21.21(b) to those licensees which are known to be potentially affected.

"GE-NE has informed all BWR utilities of this issue through the BWROG Potential Issues Response Team (PIRT). All potentially affected utilities have been notified. Compensatory action has been taken at the plants which have been determined to be reportable. Additional information is included in this notification and has been provided to the potentially affected licensees so that they can determine if the concern impacts their stability detect and suppress reload licensing calculations."

All GE BWR plants are potentially affected.

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